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I can not see why the gain should change on the basis of mains input voltage. 1 The on-board voltage regulators do just that - they regulate the voltage supplied to the rest of the electronics within a pretty tight range. They do that irrespective of the voltage that goes in to the regulator...

Your preamps probably do run a bit hotter when the supply voltage is higher. This is because the higher supply voltage translates to a higher voltage coming out of the power transformer into the rectifiers and power supply reservoir capacitors. That means that a higher voltage is being...

What kind of advice do you need? Are you looking for projects such as those listed? Do you have designs you want to share? Do you have designs or products you want to sell? There are some keen DIYers around here, but you will hook up with more designers at places like GroupDIY. Paul

I'd still put a 0.1uF (suitable voltage) across the input and output of the regulars, physically close to the regulator devices - just because it is in the data sheets :D I think, though, that these caps help with regulator stability and transient response. Your chosen op-amps may also need...

I can't see if there are caps across the regulator outputs and 0V. If not, check the data sheet for the devices used, as you probably need something like 0.1uF across the output rail and 0V. I would also suggest using heat shrink tube to insulate the active mains where it is soldered to the...

+1 The Rane technical notes are a treasure trove of good practical information. It is definitely worth the effort to browse Rane's library.

Ah, that would make sense. 19V AC would be more appropriate for 15V DC.

Aracaxis, could you grab a voltmeter and check the board voltage from the regulators? I'd have thought that 21.9V secondaries on the transformer would be on the high side for a regulated 15V. The earlier shots from the 266XL would seem to indicate that it runs from + and - 15V? It also looks...

Well, I did a little bit of reading, and it is possible that the transformer has an integral fuse. If it was my gear, I'd probably just stick in an off-the-shelf transformer - maybe 15-20VA with 15-0-15 secondaries - and install a fuse holder. Don't know how much space is inside though, and it...

no, those metal pieces are heatsinks for the voltage regulator devices. I would expect the fuse to be near the power transformer. There should be a fuse somewhere between the power input receptacle and the transformer. Can you get a pic of the power input area of the unit, including the...

If there is no fuse receptacle on the back of the unit, then it is probably on the circuit board close by the power transformer. With the unit completely unplugged from power, open the enclosure and have a look. Post a *clear* photo if you are not sure about what you see.

Did you check the fuse?

Well, all I can suggest is singing what you love. Find musicians who share the same passion. And let the synergy happen. Personally, I can hear you singing Roberta Flack. Good luck! Paul

Do you want to sing for the love of it, or to make a living? Answer that and you should gain some clarity around your further decision making. I think your voice could be very versatile - I could easily imagine you moving into jazz or even folk music. Paul

Dave, I thought you, of all people, would understand the grading of electronic components. Ranked from lowest grade to highest: 1 Standard/consumer grade 2 Industrial grade 3 medical grade 4 Aerospace/military grade and finally (in hushed and reverent tones) 5 Audio Grade The finest...

True that. At Gearslutz, the "high end" is defined as "the expensive stuff". I think that some of the "high end" sponsors over there are only too happy to keep it that way.

It seems to me ironic that the pursuit of a desirably distorted sound can cost considerably more than a clean undistorted sound. When an output transformer alone costs, say, $30-40, you just know that the cost per channel is going to be higher, even without fancy resistors and caps. Throw in...

If you want to experiment with monolithic mic preamp chips, you can get a pcb for $8 from here: Ultra Low Noise Low Distortion BAL Mic Amplifier PCB | eBay Can't vouch for the quality of the pcb, but for $12 delivered, there is minimal risk. You could build this up with any of these preamp...

Check if your motherboard provides external sata (esata). I've got a dock which provides power and connects to the esata motherboard port. The drive can just be dropped in to the dock when needed. Does this sound like it might work? Paul

I think you'll need to try some recording in both and then trust your ears. What may sound great while sitting and playing might not translate to great sound through the mic. I'd probably opt for the more "dead" space, particularly if you are laying down multiple tracks and mixing. You can...